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CAN-CBM-COM1 

CAN-CBM-COM1 Hardware Manual Rev. 1.1 

CAN - RS-232-, 

RS-422-, RS-485- 

or TTY-Interface 

Hardware - Manual

Document file: 

Date of Print: 30.10.2002 

Described PCB Version: AI410 Rev. 1.1 

Changes in the chapters 

I:\texte\Doku\MANUALS\CAN\Cbm\CBM_COM1\Englisch\COM1_11H.en9 

The changes in the user’s manual listed below affect changes in the hardware as well as changes in the 

description of the facts only. 

Chapter Changes versus previous version 

- 

- - 

Manual extended for CAN-CBM-COM1 CANopen-to-Serial for CANopen 

firmware 

Technical details are subject to change without further notice. 

CAN-CBM-COM1 Hardware Manual Rev. 1.1

CAN-CBM-COM1 Hardware Manual Rev. 1.1 

N O T E 

The information in this document has been carefully checked and is believed to be entirely reliable. esd 

makes no warranty of any kind with regard to the material in this document, and assumes no 

responsibility for any errors that may appear in this document. esd reserves the right to make changes 

without notice to this, or any of its products, to improve reliability, performance or design. 

esd assumes no responsibility for the use of any circuitry other than circuitry which is part of a product 

of esd gmbh. 

esd does not convey to the purchaser of the product described herein any license under the patent rights 

of esd gmbh nor the rights of others. 

esd electronic system design gmbh 

Vahrenwalder Str. 207 

30165 Hannover 

Germany 

Phone: +49-511-372 98-0 

Fax: +49-511-372 98-68 

E-mail: info@esd-electronics.com 

Internet: www.esd-electronics.com 

USA / Canada 

esd 

PMB 292 

20423 State Road 7 #F6 

Boca Raton, Florida 33498-6797 

USA 

Phone: +1-800-732-8006 

Fax: +1-800-732-8093 

E-mail: sales@esd-electronics.com

Contents Page 

1. Overview ................................................................. 3 

1.1 Description of the Module .............................................. 3 

1.2 Summary of Technical Data ............................................. 5 

1.2.1 General technical Data .......................................... 5 

1.2.2 CAN- and Microcontroller Unit ................................... 6 

1.2.3 Serial Interface ............................................... 7 

1.2.4 Software Support ............................................. 7 

1.3 Order Information .................................................... 8 

2. Case View and LED Description .............................................. 9 

2.1 Case ............................................................... 9 

2.2 Front View with Position of LEDs and Coding Switches ....................... 9 

2.3 LED Display ....................................................... 10 

2.3.1 State of Red and Green LED with esd Protocol ...................... 11 

2.3.2 State of Red and Green LED with CANopen Firmware ................ 12 

3. Hardware Configuration .................................................... 13 

3.1 PCB View with Position of the Jumpers ................................... 13 

3.2 Jumpers and Coding Switches .......................................... 14 

3.2.1 Default Settings of the Jumpers and the Coding Switches ............... 14 

3.2.2 Jumpers and Coding Switches of the CAN Assemblies ................. 15 

3.2.2.1 Configuration Field (X100) .............................. 15 

3.2.2.2 CAN Identifier Bits (only for esd protocol) .................. 18 

3.2.2.3 Node-ID (only for CANopen firmware) ..................... 18 

4. Description of the Assemblies ................................................ 19 

4.1 CAN Interface ...................................................... 19 

4.1.1 Bitrate ..................................................... 19 

1.5.2 Transmit and Receive Circuit of the CAN Interface (Physical Layer) ...... 19 

4.2 Serial Interface X300 (12-pin Combicon, male) ............................. 20 

4.2.1 Configuration ............................................... 20 

4.2.2 Connection of the Serial Interfaces at DSUB9 Connector ............... 21 

4.2.2.1 The RS-232 Interface .................................. 21 



4.2.2.4 The TTY(20 mA) Interface ............................. 23 

5. Connector Assignment ..................................................... 25 

5.1 CAN-Interface (X200, 5-pol. Combicon-Style) ............................. 26 

5.2 Serial Interface (X300, 12-pol. Combicon-Style) ............................ 27 

6. Correctly Wiring Electrically Isolated CAN Networks ............................ 29 

7. Circuit Diagrams .......................................................... 33 

CAN-CBM-COM1 Hardware Manual Rev. 1.1 1

2 

This page is intentionally left blank. 


1. Overview 

1.1 Description of the Module 

C 

A 

N 

B 

U 

S 

X200 

X300 

electrical isolation 

Physical 

CAN 

Layer 

ISO11898 

Power Supply 

24 V (DC) 

Coding Switches 

+5 V= 

DC/DC- 

Converter 

+5 V= 

CAN 2.0B 

Watchdog 

Digital 

I/O Ports 

RAM 

µC 

505C 

Firmware 

Flash EPROM 

Digital 

I/O Ports 

Fig. 1.1.: Block diagram of CAN-CBM-COM1-Module 

Overview 

TTY-Interface 

RS-485-Interface 



Add-On 

Plug-In 

Serial Interface 

The module CAN-CBM-COM1 offers the linking of the CAN net to a serial interface. The module can 

be equipped with the serial interfaces RS-232, RS-422, RS-485 or TTY. In the standard version the 

plug-in-place is equipped with an RS-232 driver and for the other interfaces with piggybacks. 

The CAN-CBM-COM1 module operates with a local microcontroller of C505 type, which has an 

integrated CAN controller. 

The CAN-CBM-COM1 CAN-to-Serial module (C.2841.02) works with the esd protocol. Beyond this 

the module is available as CAN-CBM-COM1 CANopen-to-Serial module (C.2841.03, C.2841.04) 

which works with CANopen firmware. Both modules are equipped with the same hardware and are 

described together in the following. Differences which result from the various software, e.g. the state 

of the LEDs, are described separately. 

The default bit rate of the CAN bus can be programmed or be changed by jumper clips on the board. 

The CAN identifier of the CAN-CBM-COM1 CAN-to-Serial module is selectable via two rotary 

switches, accessible from the outside of the module. In addition, the identifier can be programmed via 

CAN bus. For the CAN-CBM-COM1 CANopen-to-Serial module the Node-ID is selectable via the two 

rotary switches. 

CAN-CBM-COM1 Hardware Manual Rev. 1.1 3 

option 

X300 Connection 

i

i 

Overview 

The ISO 11898-compatible CAN interface allows a maximum data transmission rate of 1 Mbit/s (max. 

35 m cable length).The CAN interface is electrically isolated by means of optocouplers and DC/DCconverters. 

An additional supervision function improves the operation safety: 

The watchdog timer, integrated into the microcontroller, causes an automatic RESET of the CAN 

module after the watchdog period has expired. 

4 


1.2 Summary of Technical Data 

1.2.1 General technical Data 

Power supply 

Connectors 

Temperature range 

Overview 

permitted voltage range: 10...30 V/DC 

current consumption (at 20 /C): typ. 30 mA (RS-232 operation) 

typ. 40 mA (RS-485 operation) 

X300 (Combicon-style 

12-pin MSTB 2,5/12-ST-08) - serial interface, power supply 

X200 (Combicon-style, 

5-pin MSTB 2.5/5-5.08) - CAN interface 

0...50 /C ambient temperature 

for CAN-CBM-COM1-T: 

-40 ... + 85 /C extended temperature range 

Humidity max. 90%, non-condensing 

Dimensions 

Weight approx. 85 g 

width: 25 mm 

height: 88 mm 

depth: 85 mm 

(including hat-rail mounting and connector projection Combicon) 

Table 1.2.1: General technical data 


i

i 

Overview 

1.2.2 CAN- and Microcontroller Unit 

6 

CAN interface 

physical layer according to ISO 11898, 

electrical isolation by optocouplers and DC/DC converters 

Transfer rate selectable by jumpers or programmable between 10 kbit/s and 1 Mbit/s 

CAN identifier 

(esd protocol) 

esd-module no. 

(esd protocol) 

Node-ID 

(CANopen firmware) 

Microcontroller C505, OTP 

selectable via coding switches and jumpers or programmable, 

the module requires one Rx identifier and one Tx identifier at operation 

with default parameters 

selectable via coding switches or programmable 

selectable via coding switches 

EEPROM I²C-EEPROM for storage of parameters 

LED display four LEDs for status display of the microcontroller 

Table 1.2.2: Technical data of CAN- and microcontroller units 


1.2.3 Serial Interface 

Controller C505 

Overview 

Buffering of the serial data 256 byte memory in Tx- and 256 byte memory in Rx-direction 

Standard interface RS-232 

Possible interface equipment 

RS-232 

RS-422 

RS-485 

TTY-passive 

Handshake CTS/RTS and XON/XOFF 

Baudrate 

1.2.4 Software Support 

RS-232: max. 38,4 kbit/s 

RS-422: max. 125 kbit/s 

RS-485: max. 125 kbit/s 

TTY: typ. 1200 bit/s 

Table 1.2.3: Technical data of the serial interface 

The complete EPROM-resident communication firmware for operating the CAN-CBM-COM1-module 

is contained in the product package. 


i

i 

Overview Order Information 

1.3 Order Information 

8 

CAN-CBM-COM1 

CAN-to-Serial 

CAN-CBM-COM1 

CANopen-to-Serial 

CAN-CBM-COM1 

CANopen-to-Serial 

Type Features Order No. 

Serial Interface RS-232, 

Power supply 10 VDC...30 VDC 

with esd protocol 



CANopen firmware 

temperature range: 0 ... 50 /C 



CANopen firmware 

temperature range: -40 ... 85 /C 

Instead of RS-232 with (please state clearly in order): RS-422 Adapter 

RS-485 Adapter 

TTYp-Adapter 

C.2841.02 

C.2841.03 

C.2841.04 

X.1930.02 

X.1930.04 

X.1930.06 

CAN-CBM-COM1-ME English manual for C.2841.02 1*) C.2841.21 

1*) ... If ordered together with the module, the manual is included in the product package. 

Table 1.3.1: Order information for module CAN-CBM-COM1 


2. Case View and LED Description 

2.1 Case 

LEDRxD (yellow) 

LED1 (red) 

LED2 (green) 

GND 

- 

GND 

CTS 

GND 

RTS 

GND 

- 

TxD 

RxD 

Error 

+24V 

Stat 

GND 

LED Display 

The board is installed in a polyamide case (UEGM–MSTB) by the manufacturer Phoenix Contact. 

The front has a 12-pin Combicon connector (MSTBT 2.5/12-ST-5.08) to connect the power supply and 

the serial interface. 

Two yellow, one red and one green LED show the current module status. 

The two HEX coding switches for manual configuration are on the upper case side. 

The CAN connection, a 5-pin Combicon connector (MSTBT2.5/5-5.08), is at the lower case side. 

The case can be locked onto carrier rails according to EN 50 022 (hat- rail) by means of clips at the back 

of the case. 

2.2 Front View with Position of LEDs and Coding Switches 

LEDTxD (yellow) 

Coding switch SW110 (Low) 

Coding switch SW111 (High) 

Fig. 2.2.1: Positions of LEDs and coding switches 


LED Display 

2.3 LED Display 

The module has two yellow, one red and one green LED (see page 9). 

The functions of both yellow LEDs are described in the following table. 

LED Name Colour Status of LED Status 

Tx LEDTxD yellow off no Tx signals are received 

10 

on Tx signals are received 

RxD LEDRxD yellow off no RxD signals are received 

on RxD signals are received 

Table 2.3.1: Names and displays of the yellow LEDs 

The red and green status LED are described in the following table. 

LED Name Colour 

Error LED1 red 

Stat LED2 green 

Table 2.3.2: Names of the red and green LED 


2.3.1 State of Red and Green LED with esd Protocol 

LED Display 

The table below describes the states of the green and the red LED for the CAN-CBM-COM1 CAN-to- 

Serial module (C.2841.02) working with the esd protocol. 

State of LEDs Status of CAN module 

green LED (Stat) - constantly on 

red LED (Error) - off 

LEDs flash: 

green LED (Stat) - 250 ms, 

red LED (Error) - 50 ms 

LEDs flash: 

green LED (Stat) - 40 ms, 


LEDs flash: 

green LED (Stat) - 50 ms , 


green LED (Stat) - off 

red LED (Error) - constantly on 

Condition of module OK, module works with the 

parameters stored in the EEPROM. 

Condition of module OK, module works with the default 

parameters, because EEPROM data are faulty or 

deleted. 

actual CAN bus error 

The module discovered a temporary CAN bus error 

which is not active anymore. 

Voltage supply OK, all other functions of the module 

out of order -> microcontroller C505 does not work or 

an internal error did occur. Please, contact the service. 

Table 2.3.3: Display of the status LEDs with esd protocol 


LED Display 

2.3.2 State of Red and Green LED with CANopen Firmware 

The tables below desribe the states of the green and the red LED for the CAN-CBM-COM1 CANopento-Serial 

module (C.2841.03, C.2841.04) working with the CANopen firmware. 

12 

CANopen-RUN-LED 

State of the CAN 

module 

Single flash STOPPED - 

Blinking PRE-OPERATIONAL - 

LED on OPERATIONAL - 

CANopen-Error-LED 

LED flashes 1x 

(single flash) 

LED flashes 2x 

(double flash) 

Table 2.3.4: Display of the green CANopen-Run-LED 

State of the 

CANmodule 

warning limit 

reached 

Error Control 

Event 

Description 

Description 

- at least one of the error counters of the 

CAN controller has reached or exceeded 

the warning level (too many error frames) 

- a ‘Guard Event’ or or a ‘Heartbeat Event’ 

has occurred 

LED on Bus Off - the CAN controller is bus off 

Table 2.3.5: Display of the red CANopen-Error-LED 


3. Hardware Configuration 

3.1 PCB View with Position of the Jumpers 

Fig. 3.1.1: Position of jumpers 

Hardware Configuration 



3.2 Jumpers and Coding Switches 

The coding switches for the manual configuration and the setting of the module number are on the upper 

side of the case (see page 9). 

coding switch SW 100 (Low) 

coding switch SW 101 (High) 

The arrangement of the Jumpers and the coding switches on the component layer can be taken from 

figure 3.1.1. (page 13). 

3.2.1 Default Settings of the Jumpers and the Coding Switches 

The respective default setting (see table below) at delivery of the board is entered. 

14 

Jumper / 

Coding Switch 

Jumper 

X100 

Coding 

switches 

SW100 - LOW 

SW101 - HIGH 

Jumper 

JP300...JP330 

Function Adjustment 

Configuration bit rate 125 kbit/s 

for esd protocol (CAN-to-Serial): 

CAN identifier bits id11-id4 

for CANopen firmware 

(CANopen-to-Serial): 

Module ID 

I/O-Port Configuration 

depending on user 

serial operation 

Don’t change these jumpers ! 

Table 3.2.1: Default settings of the jumpers and coding switches 


3.2.2 Jumpers and Coding Switches of the CAN Assemblies 

3.2.2.1 Configuration Field (X100) 

1 

15 

Function of the bits: 

2 

16 

D7 

D6 

D5 

D4 

D3 

D2 

D1 

D0 

jumper open jumper closed 


Jumper X100 Bit Function 

Jumper closed --< Bit = ‘1’! 


D7 

D6 

D5 

D4 

D3 

D2 

D1 

D0 

Mode 

0: CANlink 

1: standard 

CAN bit rate 

Default: 125 kbit/s 

reserved 

for esd protocol: 

Rx/Tx-Identifier code C0 

for CANopen firmware: 

reserved 

Table 3.2.2: Configuration of the jumper X100 

Mode (D7): If this jumper is inserted the CAN-CBM-COM1 module is working automatically with 

the CANlink protocol after a RESET in the default state. Is the jumper not inserted 

(default setting) the module is not automatically working with the CANlink protocol. 

It is also possible to activate the CANlink function by the software, if it was not 

automatically activated by this jumper. 

Jumper not inserted ... no CANlink 

Jumper inserted ... CANlink


Bit rate (D6-D3): Transfer rate 

An inserted jumper sets the corresponding bit to ‘1’, here! In the column ‘l max’ the maximum possible 

line length of the CAN is specified. 

16 

jumper bits C505-register 

D6 D5 D4 D3 

0 

0 

0 

0 

0 

0 

0 

0 

1 

1 

1 

1 

1 

1 

1 

0 

0 

0 

0 

1 

1 

1 

1 

0 

0 

0 

0 

1 

1 

1 

0 

0 

1 

1 

0 

0 

1 

1 

0 

0 

1 

1 

0 

0 

1 

0 

1 

0 

1 

0 

1 

0 

1 

0 

1 

0 

1 

0 

1 

0 

BTR0 

[HEX] 

00 

00 

00 

01 

01 

02 

03 

04 

45 

09 

4B 

18 

5F 

31 

00 

BTR1 

[HEX] 

14 

18 

1C 

18 

1C 

1C 

1C 

1C 

2F 

1C 

2F 

1C 

2F 

1C 

16 

bit rate 

[kbit/s] 

1000 

666.6 

500 

333.3 

250 

166 

125 

100 

66.6 

50 

33.3 

20 

12.5 

10 

800 

typical values of the 

attainable line length 

l max [m] 

37 

80 

130 

180 

270 

420 

570 

710 

1000 

1400 

2000 

3600 

5400 

7300 

59 

minimum 

attainable line 

length l min [m] 

20 

65 

110 

160 

250 

400 

550 

700 

980 

1400 

2000 

3600 

5400 

7300 

42 

The details in the table base on the limit values of the bit timing of the CAN protocol, the run times of the local CAN 

interface and the run times of the cable. The run time of the cable is presumed with approx. 5.5 ns/m. Further 

influences, e.g., by the terminal resistances, the specific resistance, the cable geometry or other external disturbance 

influences with the transfer have not been included! 

Table 3.2.3: Setting the transfer rate by X100 


Rx/Tx-Identifier-Code C0 (D0) (only for esd protocol): 


The CAN-CBM-COM1 module (C.2841.02) has got two identifiers in the default state: A Tx identifier 

and an Rx identifier. The identifier bits id11 to id4 are adjusted by the coding switches ‘LOW’ (SW100) 

and ‘HIGH’ (SW101) (see following chapter ‘CAN identifier bits id11...id4’). 

Is the CANlink protocol activated by jumper J110 or the firmware (see software manual of the module) 

the module additionally uses the identifier TxId2 and RxId2 for the exchange of protocol data. 

The lowest identifier bits distinguish between the Tx and Rx identifiers. 

To construct a CAN net in which two CAN-CBM-COM1 modules communicate with each other 

without a programming of the identifiers, it is possible to select by the jumper clip C0, which module 

should transmit (TxId) and which should receive on the same identifier (RxId). 

An adjusted jumper clip sets C0 to the value ‘1’. 

Identifier 

bits 

id2 id1 

Allocation of the CAN Tx and Rx identifiers 

C0 = 0 

(Default adjustment) 

C0 = 1 

0 0 Rx1 Tx1 

0 1 Tx1 Rx1 

1 0 (Rx2) (Tx2) The identifiers TxId2 and 

RxId2 are only used, if 

1 1 (Tx2) (Rx2) CANlink is activated! 

Table 3.2.4: Allocation of the CAN Rx and Tx identifiers by C0 



3.2.2.2 CAN Identifier Bits (only for esd protocol) 

With the coding switches ‘HIGH’(SW101) and ‘LOW’(SW100) the identifier bits id4 to id11 of the 

CAN identifiers of the CAN-CBM-COM1 module (CAN-to-Serial, C.2841.02) are adjusted. These 8 

identifier bits are identical for all channels. 

The distinction between the channels and the Rx and Tx identifiers occurs by the lowest 2 bits (id1, id2). 

The allocation to these bits can be selected by the jumper clip X100 (see preceding chapter). 

The identifier bit id3 has always be set to ‘0’. 

The composition of the CAN identifiers of the CAN-CBM-COM1 module (CAN-to-Serial) is shown 

below: 

18 

id11 id10 id9 id8 id7 id6 id5 id4 id3 id2 id1 

DIP switch ‘HIGH’ (SW101) 

$0...$F 

DIP switch ‘LOW’ (SW100) 

$0...$F 

always 

set to ‘0’ 

Rx/Tx and 

channel 

selection 

(see page 17) 

Table 3.2.5: Allocation of the CAN identifier bits id11 to id4 to the coding switches 

If the module runs with the default parameters, the value adjusted by the coding switches also 

corresponds to the esd module no. (see software manual of the module). 

The local software of the module provides also the possibility to program all 11 bits of the identifiers of 

the module independently. Further information about this can be taken from the software manual of the 

module. 

Attention: The user has to secure that the identifiers of following modules are selected with an offset 

of +$2 (+$4, if CANlink is used), because otherwise intersections of the identifiers would 

arise! 

3.2.2.3 Node-ID (only for CANopen firmware) 

With the coding switches ‘HIGH’(SW101) and ‘LOW’(SW100) the Node-ID of the CAN-CBM-COM1 

module (CANopen-to-Serial, C.2841.03, C.2841.04 ) is set. The value range of the Node-ID is 0 to 127 

(0...7F h). 

Coding switch HIGH (SW101) Coding switch LOW (SW100) 

$0...$7 $0...$F 

Table 3.2.6: Setting of Node-ID 


4. Description of the Assemblies 

4.1 CAN Interface 

4.1.1 Bitrate 

Description of the Assemblies 

The transmission speed can be varied from 10 kbit/s to 1.0 Mbit/s. The selection of the bit rate is made 

by the configuration field X100. 

The local software of the module provides the possibility to reprogram the bit rate. The programmed 

bit rate replaces the bit rate adjusted by X100. Further information about this can be taken from the 

software manual of the module. 

A detailed overview of the possible bit rates can be taken from the description of jumper clip X100 (see 

page 16). 

1.5.2 Transmit and Receive Circuit of the CAN Interface (Physical Layer) 

The physical CAN interface of esd complies with the ISO 11898 standard. The connection to the bus 

occurs by a 5-pin Combicon connector. 

The voltage supply of the CAN bus is electrically isolated from the 24 V supply and the microcontroller 

C505. 

The electrical isolation of the signals to the CAN bus is realized by optocouplers. 



4.2 Serial Interface X300 (12-pin Combicon, male) 

4.2.1 Configuration 

The serial Interface of the CAN-CBM-COM1 can be configured as RS-232, RS-422, RS-485 or TTY 

interface, depending on the insertion of driver (for RS-232) and piggyback (for RS-422, RS-485 and 

TTY). 

The interface is controlled by the microcontroller component C505. To buffer the serial data 256 bytes 

memory is supported for both data directions. 

The maximum possible bit rate of the serial interfaces is limited by the selected physical layer: 

20 

Physical Interface Bit Rate 

RS-232 

RS-422 

RS-485 

TTY 

max. ca. 38,4 kbit/s 

max. ca. 125 kbit/s 

max. ca. 125 kbit/s 

typical: 1200 bit/s 

Table 4.2.1: Bit rates of the serial interface 


4.2.2 Connection of the Serial Interfaces at DSUB9 Connector 

TxD 

RxD 

CTS 

RTS 

GND 

4 

3 

9 

7 

6 


Below the wiring of the serial interface in relation to the data direction is shown. The figures should 

explain the short terms of the signals used in the appendix (connector assignment). Furthermore the 

circuit layouts of the various available piggybacks can be found in the appendix (circuit diagrams). 

4.2.2.1 The RS-232 Interface 

The signal description is given exemplary for the connection of the CAN-CBM-COM1 module as a 

modem (DCE). 

CAN-CBM-COM1 

local signal terms 

MSTB connector 

line: 

RxD 


TxD 

RTS 

CTS 

GND 

pin numbers of the 12-pole MSTB connector 

pin numbers of the 9-pole DSUB socket 

DSUB9 socket 

Fig. 4.2.2: Connection scheme for RS-232 operation 

2 

3 

7 

8 

5 

Terminal 

(Example: PC as DTE) 

RxD 

TxD 

RTS 

CTS 

GND

22 



CAN-CBM-COM1 Termimal 

TxD 

RxD 

GND 

local 

signal terms 


3 

5 

11 

7 

6 

Tx+ 

Tx- 

Rx+ 

Rx- 

GND 

pin numbers of the 12-pole MSTB socket 


RxD 

TxD 

GND 

TxD 5 

RxD 

Rx/Tx- 

RxD 

RTS 

CAN-CBM-COM1 

+5V 

1 k 

150 

3 

11 

7 

Rx/Tx+ 

TERM+ 

TERM- 

1 k 

6 

GND 

GND GND 

local 

signal terms 

Terminal 

pin numbers of the 12-pole MSTB socket 


To activate the terminal-resistance network which is on the piggyback, e.g. the pin 3 and 11 as well as 

pin 5 and 7 of the MSTB connector have to be connected. 

TxD 


4.2.2.4 The TTY(20 mA) Interface 

CAN-CBM-COM1 

TxD 

RxD 

local 

signal terms 

3 

5 

11 

7 

Tx+ 

Tx- 

Rx+ 

Rx- 

i=20mA 

i=20mA 


i=20mA 

i=20mA 


-U 

-U 

pin numbers of the 12-poe MSTB socket 

Terminal 

Fig. 4.2.6: Connection scheme for TTY operation (passive) 

RxD 

TxD 

+U 

+U

24 



5. Connector Assignment 

GND 

- 

GND 

CTS 

GND 

RTS 

GND 

- 

TxD 

RxD 

Error 

+24V 

Stat 

GND 

Connector Assignment 

Serial Interface (X300) 

5 n.c. 

4 CAN HIGH 

2 CAN LOW 

1 CAN GND 


3 n.c. 

CAN Interface (X200) 

Fig. 5.1.1: Position of connector X200 and X300


5.1 CAN-Interface (X200, 5-pol. Combicon-Style) 

26 

Pin Position: Pin Assignment: 

Signal Description: 

CAN_L, 

CAN_H... CAN-signal lines 

CAN_GND ... reference potential of CAN-physical layer 

5 

4 

3 

2 

1 

Pin Signal 

5 n.c. 

4 CAN_H 

3 n.c. 

2 CAN_L 

1 CAN_GND 

Fig 5.1: Adapter cable 5-pole Combicon to 9-pole DSUB 

The 9-pin DSUB 

connector is 

assigned in 

accordance with 

CiA DS 102. 


5.2 Serial Interface (X300, 12-pol. Combicon-Style) 

Pin Position: Pin Assignment: 

12 

11 

10 

9 

8 

7 

6 

5 

4 

3 

2 

1 

Pin 

Signal 

RS-232 

Signal 

RS-422 


Signal 

RS-485 

Signal 

TTY 

12 GND GND GND GND 

11 n.c. Rx+ Term+ Rx+ 


9 CTS GND GND I2 


7 RTS Rx- Term- Rx- 


5 n.c. Tx- Tx/Rx- Tx- 

4 Tx n.c. n.c. I1 

3 RxD Tx+ Tx/Rx+ Tx+ 

2 +24 V +24 V +24 V +24 V 



28 



CAN_H 

CAN_L 

CAN_GND 

Shielded wire with 

transposed wires 

120 Ohm 

DSUB9 connector 

(female or male) 

CAN_GND 

DSUB9 connector 

(female or male) 

pin designation 

(at wire shield) 

pin designation 

1 

2 

n.c. 

CAN_L 

n.c. 

1 

2 

3 

3 

4 

n.c. 

n.c. 

4 

5 

n.c. 

n.c. 

5 

6 

7 

n.c. 

CAN_H 

n.c. 

6 

7 

8 

n.c. 

n.c. 

8 

9 

n.c. 

n.c. 

9 

connector case n.c. 

n.c. connector case 

n.c. = not connected 

Wiring 

6. Correctly Wiring Electrically Isolated CAN Networks 

Generally all instructions applying for wiring regarding an electromagnetic compatible installation, 

wiring, cross sections of wires, material to be used, minimum distances, lightning protection, etc. have 

to be followed. 

The following general rules for the CAN wiring must be followed: 

1. 

2. 

3. 

A CAN net must not branch (exception: short dead-end feeders) and has to be terminated 

by the wave impedance of the wire (generally 120 Ω ±10%) at both ends (between the 

signals CAN_L and CAN_H and not at GND)! 

A CAN data wire requires two twisted wires and a wire to conduct the reference potential 

(CAN_GND)! 

For this the shield of the wire should be used! 

The reference potential CAN_GND has to be connected to the earth potential (PE) at one 

point. Exactly one connection to earth has to be established! 

4. The bit rate has to be adapted to the wire length. 

5. Dead-end feeders have to kept as short as possible (l < 0.3 m)! 

6. 

7. 

8. 

When using double shielded wires the external shield has to be connected to the earth 

potential (PE) at one point. There must be not more than one connection to earth. 

A suitable type of wire (wave impedance ca. 120 Ω ±10%) has to be used and the voltage 

loss in the wire has to be considered! 

CAN wires should not be laid directly next to disturbing sources. If this cannot be avoided, 

double shielded wires are preferable. 

Wire structure Signal assignment of wire and connection of earthing and terminator 

CAN wire with connectors 

Figure: Structure and connection of wire 


120 Ohm 

earth (PE)

Cabling 

30 

Wiring 

for devices which have only one CAN connector use T-connector and dead-end feeder (shorter than 

0.3 m) (available as accessory) 

CAN 

Board 

e.g. PCI/331, 

ISA/331, 

VME-CAN2, etc. 

Net 1 

Net 2 

Connecting 

CAN_GND to 

Protective Conductor PE 

PE 

l < 0,3 m 

CAN 

Module 

CDIO16/16 

Terminal Resistance 

Terminator 

with PE Connector 

T-Connector 

CAN 

Module 

CMIO 

CAN 

Module 

CAI810 

CAN_H 

CAN_L 

CAN_GND 

T-Connector 

l < 0,3 m 

CAN-SPS 

Interface 

CSC595/2 

or 

CAN-PC Board 

Female Connector 

Male Connector 

Male Terminator 

Female Terminator 

Terminator 

CAN 

Module 

CDMS4 

Figure: Example for correct wiring (when using single shielded wires) 

use external terminator, because this CAN later be found again more easily! 

9-pin DSUB terminator with male and female contacts and earth terminal are available as 

accessories 

Earthing 

CAN_GND has to be conducted in the CAN wire, because the individual esd modules are 

electrically isolated from each other! 

CAN_GND has to be connected to the earth potential (PE) at exactly one point in the net! 

each CAN user without electrically isolated interface works as an earthing, therefore: do not 

connect more than one user without potential separation! 

Earthing CAN e.g. be made at a connector 


Wire Length 

Wiring 

Optical couplers are delaying the CAN signals. By using fast optical couplers and testing each board 

at 1 Mbit/s, however, esd CAN guarantee a reachable length of 37 m at 1 Mbit/s for most esd CAN 

modules within a closed net without impedance disturbances like e.g. longer dead-end feeders. 

(Exception: CAN-CBM-DIO8, -AI4 and AO4 (these modules work only up to 10 m with 1 Mbit/s)) 

Bit rate 

[kbit/s] 

1000 

800 

666.6 

500 

333.3 

250 

166 

125 

100 

66.6 

50 

33.3 

20 

12.5 

10 

Typical values of reachable 

wire length with esd 

interface l max [m] 

37 

59 

80 

130 

180 

270 

420 

570 

710 

1000 

1400 

2000 

3600 

5400 

7300 

CiA recommendations 

(07/95) for reachable wire 

lengths l min [m] 

25 

50 

- 

100 

- 

250 

- 

500 

650 

- 

1000 

- 

2500 

- 

5000 

Table: Reachable wire lengths depending on the bit rate when using esd-CAN interfaces 

Examples for Suitable Types of Wire 

Manufacturer Type of wire Manufacturer Type of wire 

U.I. LAPP GmbH & Co. KG 

Schulze-Delitzsch-Straße 25 

70565 Stuttgart 

metrofunk 

KABEL-UNION GmbH 

Postfach 410109 

12111 Berlin 

UNITRONIC ®-BUS LD, 

UNITRONIC ®-BUS FD P LD 

LiYCY 2 x 0,38 mm², LiYCY 2 x 0,5 mm², 

LiYCY 2 x 0,75 mm², LiYCY 2 x 1,0 mm², 

1P x AWG 22 C, 1P x AWG 20 C 

Alcatel Kabelmetal 

Kabelkamp 20 

30179 Hannover 

ConCab Kabel GmbH 

Äußerer Eichwald 

74535 Mainhardt 

DUE 4401, DUE 4001, 

DUE 4402 

1 x 2 x 0,22 mm² 

Order no.: 93022016 

(UL approved) 


32 

Wiring 



7. Circuit Diagrams 

Circuit Diagrams 

The PDF-file of this document does not contain the circuit diagrams. The circuit diagrams are shipped 

on request.

Download Hardware Manual (PDF file) - esd electronics, Inc.

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